there are a number of choices with respect to connection of the fuel supply to your new
carburetor you'll either have a single feed 4160 with a single inlet bowl a dual feed
4160 with separate inlets for each fuel bowl or you'll have a 4150 model which will also
have dual feed bowls the difference between the dual feed 4160 and dual feed 4150 models
is that there's no secondary metering block on the 4160 models so the distance from center
to center of the bowl inlets is shorter when compared to the 4150 models to start the connection
process let's look at the fuel line some stock carburetor types had steel fuel lines that
ended in flare compression fittings some steel lines will fit directly to the inverted flare
fitting that comes in place on most single inlet fuel bowls this can be the case for
many 4160 4165 and 4175 applications sometimes all that will be needed is to remove the existing
flare fitting and replace with one that matches the threading of your existing fuel line if
your steel lines wont match with the position of your new Holley carburetor you may need
to make an adjustment in this case you can either change the entire fuel line from the
fuel pump to the carburetor with fuel plumping supplies from Earl's or you can modify the
existing line and fittings to work with your new carburetor one popular choice is to use
a tubing cutter to remove the end of the fuel line that ends in a compression fitting you
can also use this tool to modify a fuel line that might be pointing in the wrong direction
for the fuel entry point on your new carburetor when slipping a fuel hose on to a cut line
that has no barb make sure the inner diameter of the hose matches to the outer diameter
of the metal line outer diameters of steel lines will match either a 5/16ths or a 3/8ths
of an inch inner diameter of fuel hose that should be available at any auto parts store
it's also a good idea to use 2 hose clamps to prevent a fuel leak the next item along
the fuel line should be a filter such as Holley part number 162-563 every carburetor should
have an inline filter located between the fuel pump and the carburetor inlet for dual
feed carbs the filter needs to be installed just after the main fuel line and before any
fuel line splits also be sure to examine the filter for a label that shows which side is
the inlet so that it's installed in the correct orientation for single feed carburetors if
your fuel hose inner diameter is 5/16ths of an inch you can use the non swivel part number
26-24 or the swivel banjo fitting part number 26-25 for the banjo fitting start with one
gasket on one side of the banjo and another gasket on the other side remove the compressing
fitting from the carburetor and swap the brass or screen filter from the compression fitting
into the banjo fitting then cinch the assembly in place at your preferred angle and tighten
snugly use the exact size wrench to prevent rounding off a corner of the banjo fitting
if you have a 3/8ths inch inner diameter fuel hose you'll need to use part number 26-29
there are also options for connecting AN style fittings to a single feed carburetor by using
part number 26-75 for dual feed carbs there are a lot of choices part number 34-150 is
meant for use with 4150 models if your 4160 has center hung float bowls you'll need part
number 34-160 which is a bit shorter because as mentioned the 4160's have no secondary
metering block both lines are stamped with their intended model number usage center hung
bowls come with the fitting number 26-27 preinstalled this fitting screws into the 7/8ths twenty
thread count of the bowl and has a 5/8ths eighteen thread count inverted flare to accept
the fuel lines you can remove these fittings and use one of a lot of different offering
s from Earl's like part number 101276ERL there are other ascetics as well such as the 103176
which has bent lines and all of the equivalent Earl's products are available in the Ano-Tuff
series with silver and black coloring Street Avenger carburetors come with all of the fuel
line connections pieces you'll need to get your carburetor connected to a fuel supply
if you want to use the included parts install the fuel line fittings first and then the
hose pieces if your fuel line is at the front of the engine the longer pieces go to the
rear bowl and then the shorter one to the front bowl join the two hoses with the included
fuel tee and you'll have a 3/8ths entry point for fuel coming from your fuel line or filter
for models other than the Avenger series the most economical and cleanest looking set ups
will be any of the one piece hard lines that we mentioned earlier now that the fuel feed
line is in it's time to finish off the fuel supply connection if you have a hard line
installed all you need is one of the 34-21 or 34-22 adaptors hold the line in place with
a wrench and cinch it on nice and tight also make sure that you've pulled the pressure
tap plug and sealed it with a liquid teflon sealant don;t use teflon tape pieces can break
off inside and they might even causes clogs or even fuel flooding be careful about your
routing to make sure that your fuel line and filter don't interfere with any other under
hood components in the advanced tuning section we show you how to properly fill the bowls
with fuel to prepare for start up but for now let's move on to the last few steps of
the installation